I am unable to open a website in an iframe

Please note that some website do not allow to be opened in an iframe. Websites such as Twitter and Facebook are know to block that. They do it for security purposes and to make sure their users are not victims of phishing.

I would like to only have one thumbnail to display a gallery

I open input fields into prettyPhoto but cannot click into them.

This is because by default prettyPhoto takes over the keyboard to assign custom shortcuts. To make inputs clickable, you need to disable keyboard shortcuts, that can be done with the following setting: